Fix: basefiles: add missing user/group for dhcpcd

Signed-off-by: David Oberhollenzer <goliath@infraroot.at>

pkg/basefiles/etc/group

@@ -5,4 +5,5 @@ dnsmasq:x:51:
 unbound:x:52:
 syslogd:x:53:
 nginx:x:54:
+dhcpcd:x:55:
 nogroup:x:99:

pkg/basefiles/etc/passwd

@@ -4,4 +4,5 @@ dnsmasq:x:51:51:dnsmasq user:/dev/null:/bin/false
 unbound:x:52:52:unbound user:/dev/null:/bin/false
 syslogd:x:53:53:syslog user:/dev/null:/bin/false
 nginx:x:54:54:syslog user:/dev/null:/bin/false
+dhcpcd:x:55:55:dhcpcd user:/var/run/dhcpcd_chroot:/bin/false
 nobody:x:99:99:Unprivileged User:/dev/null:/bin/false